All aluminum. Similar to the original Harmon wah-wah mute (model B-1, our number 02619), except for two features: (1) there is no stem (tube and cup), (2) there are no ribs around the mute body. Made in USA. -cdp
The Harmon Solomaster Wow-Wow mute. A great mute for solos, especially when played into a microphone. Perfect Harmon sound for early jazz or ragtime performances. -the manufacturer